I do not when this started, I just decided to edit/update my favourites this morning.
There are two issues.
1. If you context click 'Rename', the existing text is highlighted (as expected) ... if you press backspace before positioning the caret then the text is deleted (also as expected) ... BUT if you did not intend to delete the lot (it happens [:O]) ... cmd-Z does not work at all whilst editing, and the escape key causes the mac to beep rather than abandoning changes, and cmd-z after saving the changes does not revert the mistake. Is there is no way back from accidental editing? Maybe it has always been thus?
2. The editing graphics are out of alignment. I seem to remember something similar in L4.

I am editing 1 Kings, but the display has a rectangle around 2 Kings.